Fluid-fuel furnace for heating castings.



R. W. WIEDERWAX.

FLUID FUEL FURNACE FOR-HEATING CASTINGS,

APPLICATION FILED FEB. I3, |917.

Imm Y Patentedquly 24,1917.

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FLUID FUEL FURNACE FOR HEATING CASTINGS.

APPLICATION FILED FEB. 1'3, 1917.

'1 34,240. Patented July 24, 1917.

ROBERT W. WIEDERWAX, `035" ATLANTIC CITY, NEW JERSEY, ASSIGNOR OF ONE-HALF TO CARLTON GEIST, OF ATLANTIC CITY, NEW' JERSEY.

FLUID-FUEL FRNACE FOR HEATING CASTINGS.

Specification of Letters Patent.

Patented July 24, 1917.

Application filed February 13, 1917. Serial No. 148,315.

To all whom it may concern:

Be it known that I, ROBERT W. WIEDER- wAx, a citizen of the United States, residing at Atlantic City, in the county of Atlantic and State of New Jersey, have invented certain new and useful Improvements in Fluid- Fuel Furnaces for Heating Castings, of which the following is a specification.

My invention relates to a fluid fuel operated furnace for properly heating castings, particularly hollow castings, such as the cylinders of an engine, etc., preparatory to or in connection `'with welding, for preventing cracking or distorting of the casting, due to such heating or cooling after heating.

As far as I am aware, at the present time, the heating of castings or the like, preparatory to or in connection with their welding, is accomplished by means of charcoal or a charcoal operated furnace. I am aware that attempts have heretofore been made to provide heating machines of this character, employing gas or oil as fuel, but such machines have not proven wholly satisfactory.

In the heating of castings, particularly hollow castings, prior to or in connection with welding, it is necessary to evenly or uniformly heat all portions of the casting, thus preventing cracking or distortion thereof. When heating automobile cylinders, should the same become distorted or warped due to uneven heating of portions thereof, it is necessary to rebore the cylinder.

As far as I am aware, at the present time, the only successful means for properly heating castings is by the employment of charcoal or a charcoal operated furnace, which is disadvantageous inasmuch as the process is slow and expensive.

An important object of the invention is to provide a furnace of the above mentioned character, by the employment of which all portions of the casting may be evenly heated and cooled, effectively preventing cracking or warping.

Other objects and advantages of the 1nvention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation of apparatus embodying my invention,

Fig. 2 is a plan view of the same,

Fig. 3 is a longitudinal sectional View taken on line 3-3 of Fig. 2,

Fig. 4 is a transverse sectional view taken on line 1&4 of Fig. 1,

Fig 5 is a side elevation of a car or carriage, included in the apparatus,

Fig. 6 is a perspective view of the brake bar or rod, and,

Fig, 7 is a similar View of a heat absorbing member.

In the drawings, wherein for the purpose of illustration is shown a preferred. embodiment of my invention, the numeral 10 designates the body portion or shell of the furnace, which is preferably formed of sheet metal, while the same may be made of any other suitable material. The upper portion of the shell l0 forms a heating chamber 11 open at its top and which is preferably lined with a refractory material, such as lire tile or brick 12, as shown. Arranged beneath the heating chamber 11 is a dump box or chamber 13, one side of which has an opening which is normally closed by a preferably vertically swinging Vdoor 14, which may be retained closed by any suitable means. Y

As more clearly shown in Figs. 2 and 3, the numeral 15 designates removable hori- Zontal grate bars, arranged between the heating chamber 11 in the dump box 13. The forward end of these grate bars are detachably supported by means of sockets 16 or the like, rigidly secured to the end wall 17 of the box 13, while their opposite ends are arranged upon the top of the end wall 18 of the box, the corresponding end of the heating chamber 11 being open, as shown.

Extending longitudinally through the shell 10 in proximity to the bars 15 are horizontal track rails 19, which are supported by the end wall 18 and have their forward ends projecting into sockets 20, fixed to the end wall 17. It is obvious that these track rails can be removed if desired. The track rails 19 extend rearwardlybeyond the furnace for any suitable distance and are supported by any suitable means (not shown).

Adapted to travel upon the track rails 19 is a car or carriage 21, having l'ianged wheels 22 to engage with the rails.

Asabove stated, the rear end of the heating chamber 11 above and adjacent the end wall 18 is open, and this open end may be closed by a vertically sliding door 23, operating in vertical guides 211:. The side walls of the heating chamber l1, adjacent the rear endsfthereof, and at the tops are connected by a transverse bar25, preferably arranged exteriorly of the slidingdoor 23. The door 23 has connection with a flexible element,

suoli as ay cable 26, passed about the grooved ward end wall 31, of the heating chamber 1l is provided with an opening 32 normally covered by a movable plate, in registration with the opening 30, when the door 23 is in the lowerniost position.

The side walls 11 of the heating chamber 11 are provided with openings 33, receiving gas burner tips 34, connected with pipes 35. The upper and lower sets of gas burner tips 34 extend inwardlyy for asubstantial distance beyond the intermediate burner tips. The function of'having these tips iii-of different lengths, as stated, is to provide means whereby the free endsof the same will be arranged at approximately equal distances from the center of the casting 4Q, thereby evenly distributing the heat to the casting. These pipes 35 arek connected with horizontal pipes 36, through the medium of valves 37 and associated elements. The pipes 36 areconnected with a common gas yfeed pipe 88, having a cut offfvalve 39 connected therewith. Connected with one pipe 36 is a pilot light burner 40, projecting into the chamber 11 and having a valve 41 connected therein.`

1n the operation of the apparatus, the casting to be heated, in the present illustration, the cylinder l2 of an engine, is placed upon the car 21, and the car is pushedinto the heating chamber 11.L The grate bars 15 are then arranged in place and the door 23' is moved to the lower or closedl position. The space between the casting 42' and the walls of the heating chamber 11 is filled with heat absorbing and radiating elements f 43,'which may be formed of. fire clay and silica, such elements being of suitablesize,

as shown. This having been done, the pilot light -tO being lighted, upon turning on the gas to the burner tips 34 by opening valves 37, these burner tips will be 'lighted and the flame and products of combustion discharged intoy the heating chamber 11, in the presence of tlieli'eat absorbing elements 43. rlhese f heat absorbing elements take up the heat and transmit the sainev to the casting 42, so thatv y all portions of the casting lare evenly heated.'

kAt the end of the heating period, the rods 15 are first removed, and the elements 43 drop into the box 13, and may be removed Copies of 'this patent may be obtained for by swinging the door 14; open. The door 23 is now elevated and the carriage 23 moved out of the heating chamber 11. The heated ,casting is now moved to the welding mau a u chine and the same is welded. f

Afterthis treatment, it is necessary that the castingr be cooled gradually so that all portions thereof remain at substantially the same temperature and for this purpose, burner tips 34C being first extinguished, the casting is reintroduced into the heating chamberk 11.y The heated elements 8f are again piled in the heating chamber` 11 about the casting and gradually give up or radiate their heat, thus causing the casting to cool' Having thus described my invention, 1'

claim: n

n 1. In apparatus of thecharacter described, a heating shell having its side walls provided witli sets of openings,burner tips extending yinto the heating shell through the openings, the upper and'lower tips extending inwardly for a substantially greater distance thanythe intermediate tips, and means f to supply fluid fuel to the tips.

2. In apparatus ofthe character described,

an upstanding shell having its top open and' provided with an upper'heating-chamber in free communication withthe opening in the top and a lowerl dump chamber having an opening .for theL withdrawal of material therefrom, a'removable grate arranged approximatelyk horizontally between the heating chamber andthe dumpr chamber, a trackr extending into theshell and `having van approximatelyhorizontal portion arranged adjacent the removable grate, acarriage to travel upon the track' and 'adapted to be passedinto the upstanding shell through one open end thereof and receive andV support-the casting or the like to be heated, a

movable door' for closingY the open end of the upstanding shell, heat absorbingand v'radiating elements disposed within the shell f andfsupported'by the removable grate, and

means arranged within the upstanding'shell toy heat theelements.

In testimony whereof 1 a'liix myy signature in presence of two witnesses.k

ROBERT w. wiiaiiiiiinviix.` y

Witnesses:

EMMA H. YARD, LAURA SHANER.

live cents each, by addressing the Commissioner ofatents, Washington, 3D. C3 f 

